Adjustable eraser



March 5, 1940. F. M- HALE 2,192,470

ADJUSTABLE ERASER Filed Feb. 21, 195s frm/mf, im@

INVENTOR ATTO R N EYS Patented Mar, 5', 194() y UNITED. f STATES EATKENT FFCE ".AVDJUSTABLE' cansan v wenn M. nale', Mexico, n. F., Meer@ applicati@ February 21, 1938 serial' No. 191.805 eclaims. (ci. 1ero-es)l invention relates to new and useful improvements in mechanical pencils generally, although more particularly to such pencils which are equipped with extensible and renewable The principal object. of my invention isA to provide a mechanical pencil with a relativelylong.

eraser which is adapted `to be mechanically extended into position Vfor use or retracted there- 101 from.

. Another object orf-my inventionisy to provide 'ufacture y With these andother objects in view which will more fully appear, the nature ofthe invention will oe more clearly understood byqfollowing the description, the appended claims, and the several views illustrated in the accompanying drawing.

In the drawing: l i

Figure l is a front elevation, partly in section, of a mechanical pencil constructed in accordance with my invention,

Figure 2 is an enlarged longitudinal section of the upper portion thereof,

Figure 3 is an enlarged detail view of the 0perating assembly, l

Figuref is a horizontal section taken on line 4-4 of Figure 2, y y

Figure 5 is a horizontal' section taken on line 5 5 of Figure 2, and

35 Figure 6 is a horizontal section taken on line G-E of Figure 2. n

Like reference numerals designate corresponding parts throughout the several figures of the drawing.

40 Referring to the drawing in detail, my invention is embodied in a mechanical pencil A vhaving the usual pencil `lead propelling means B and my improved eraser propelling and retracting a deviceof the above charactenvvhich is simple in construction, durable, and economical to man- The threads, il) thereon, isprovided at itslower end with an enlarged cylindrical end'portion Il and astudi? which dependsy therefrom. The stud l2: is rigidly mounted in the recess 8 by al drive et.

A cup i3 is located'l directly above the enlarged 'end portion!! andis threadably'engaged with the shaft 9, said cup frictionally receiving the lower end of an elongated eraser I4 which is provided with a longitudinal bore l5 forreceiving ther shaft Si, said bore extending throughout thelength of the eraser. An actuating sleeve I6 surrounds the eraser and is splined to `the cup ,I3 .through the medium of diametrically disposed longitudinal grooves Hr, .lll formed. in .the

inner face of the sleeve and cooperating splines i8, i8 formed on the cup. Thuswhen the sleeve lli-is rotated,l in either direction, the cup i3 will oe likewise rotated and alsornoved longitudinal- 1y alone the screw shaft. 9, thereby either proiectng or retractngfthe 'eraser with respect to the upper endL of, the sleeve. In order to retain the sleeve in alinemerit with. the screw shaft andk hold it from endwise movement when rotated about the'shaft, a collar 9 is freely mounted on the enlarged portion il of the shaft and is provided at its lower end with an 'inner angular ange 2li which engages under said portion ll ywith swivel effect. l The collar is provided with diametrically disposed keys 2l, 2l which are tted tightly in the grooves Il, il. of the sleeve sufciently to hold the parts normally in fixed relation to each other except whenexcess force is applied endwise to separate them. 'A removable closure cap' 22'is mounted on the upper end of the sleeve.

It is of course tobe understood that the details of structure andI arrangement of parts may be'variously changed and modified without departing from the spirit and scope of my invention. f

I claim:l v 1. A holder for aneraser including a base elev ment made and adapted to be mounted stationarily on the upper end of a pencil barrel, said 'oase element being provided with an axial recess in its outer end, a longitudinally extending screwshaft provided with an enlarged cylindrical inner v` end portion having an axial studextended theren from and fixedly mounted in said axial recess of the base elementari eraser-receiving and holding cup having a correspondingly screw-threaded axial opening in its bottom fitted on the threaded portion of said screw-shaft, an elongated eraser element of circular` cross section throughout,

xedly secured at its inner end insaid cup and having a longitudinal bore for receiving said screw-shaft freely slidable therein and without intertting threaded engagement therebetween, and an actuating sleeve surrounding said eraser element free of direct attachment thereto but attached at its inner end with swivel eiect to the cylindrical enlargement of said screw-shaft whereby to rotate freely about the enlargement but without relative longitudinal movement, said sleeve having longitudinally slidable driving engagement with said eraser-receiving and holding cup whereby the cup rotates therewith and simultaneously moves lengthwise on the screwshaft.

2. A holder for an eraser including a base element in the form of a screw-plug adapted to be tted normally stationary in the upper end of a pencil barrel, said screw-plug being provided with-4 an axial recess in its outer end, a longitudinally extending screw-shaft provided with an enlarged cylindrical inner end portion having an axial stud extended therefrom and xedly mounted in said axial recess of the screw-plug with the inner end of said cylindrical enlargement spaced from the screw-plug, a cylindrical collar surrounding and freely rotatable about said cylindrical shaft enlargement and provided at its inner end with an inturned annular flange tted rotatably under the inner end portion of said cylindrical shaft enlargement and in abutting relation to the adjacent end portion of said screwplug, an actuating sleeve detachably but supportingly keyed at its inner end portion on said collar whereby to rotate xedly with the collar in concentric spaced relation to said screw-shaft, said sleeve being longitudinally grooved internally, a cylindrical eraser-receiving and holding cup having a correspondingly screw-threaded axial opening in its bottom fitted on the threaded portion of said screw-shaft and provided with a circumferential spline fitted slidably in the longitudinal groove of said actuating sleeve whereby thel cup rotates with the sleeve and at the same time moves lengthwise on the shaft, and an elongated tubular eraser element of circular cross section throughout, sleeved freely over said screw-shaft and without intertting threaded engagement therebetween but fitted at its inner end portion in said eraser-receiving and `holding cup whereby to rotate and travel lengthwise therewith.

3. A holder for an eraser including a base element made and` adapted to bemounted stationarily on the upper end portion of a pencil barrel, a stationarily mounted elongated screw-shaft extending rigidly and axially from said base element, said shaft 4having a cylindrical enlargement near its inner end and the inner end of the enlargement being spaced from the adjacent end portion of the lbase element, a cylindrical collar surrounding said cylindrical enlargement of said screw-shaft and rotatable freely thereabout, said collar being providedA at its inner end with an inturned annular flange engaged under said cylindrical enlargement of the screw-shaft and abutting the outer end of the base element, an actuating sleeve having its inner end `portion detachably fitted onsaid collar but keyed thereto so as to rotatetherewith and being thereby supported in concentric spaced relation about said screwshaft, a cylindrical eraser-receiving and holding cup provided with a screw-threaded axial opening in its bottom fitted on the threaded portion of said screw-shaft and having a longitudinally slidable driving engagement with said actuating sleeve, whereby the cup rotates with the Sleeve and simultaneously moves lengthwise on the screwshaft, and an elongated eraser element of circular cross section throughout', secured at its inner end in said cup whereby to rotate and travel lengthwise therewith and having a longitudinal bore for receiving said screw-shaft v freely and without intertting between.

' FRANK M. HALE.

threaded engagement there- 

